Mobile device

ABSTRACT

A mobile device is disclosed. A mobile device comprises a display, a battery disposed on the back side of the display, and a film speaker disposed on the back side of the battery.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is a continuation based on PCT Application No.PCT/JP2014/081061 filed on Nov. 25, 2014, which claims the benefit ofJapanese Application No. 2013-242967, filed on Nov. 25, 2013. PCTApplication No. PCT/JP2014/081061 is entitled “MOBILE TERMINAL”, andJapanese Application No. 2013-242967 is entitled “MOBILE DEVICE”. Thecontents of which are incorporated by reference herein in theirentirety.

FIELD

Embodiments of the present disclosure relate to a mobile device, andmore particularly relate to a mobile device with a built-in speaker.

BACKGROUND

A mobile terminal with a built-in speaker has conventionally beenproposed. In the mobile terminal, the speaker is disposed at a givenangle in a corner portion of a housing to achieve size and thicknessreduction of the mobile terminal.

SUMMARY

A mobile device is disclosed. In one embodiment, a mobile devicecomprises a display, a battery disposed on the back side of the display,and a film speaker disposed on the back side of the battery.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A illustrates an external view showing an example of an externalappearance of a surface of a mobile device according to an embodiment ofthe disclosure.

FIG. 1B illustrates an external view showing an external appearance of aback surface of the mobile device.

FIG. 2A illustrates an explanatory diagram showing an example of anexternal appearance of a film speaker built in the mobile deviceillustrated in FIG. 1 when viewed from front.

FIG. 2B illustrates an explanatory diagram showing an example of asection taken along a IIB-IIB line illustrated in FIG. 2A.

FIG. 3 illustrates an exploded perspective view showing an example of anoutline of an internal structure of the mobile device illustrated inFIG. 1.

FIG. 4A illustrates an explanatory diagram showing an example of a stateof a mounting frame illustrated in FIG. 2A and FIG. 2B.

FIG. 4B illustrates an explanatory diagram showing a state of themounting frame when viewed from the back side.

FIG. 5A illustrates an explanatory diagram showing an example of thefront side of the mounting frame illustrated in FIGS. 2A and 2B to whicha first film speaker and a second film speaker are attached, in whichnecessary parts are mounted.

FIG. 5B illustrates an example of the back side of the mounting frame towhich the first film speaker and the second film speaker are bonded.

FIG. 5C illustrates an example of the back side of the mounting frame onwhich a substrate is disposed.

FIG. 5D illustrates an example of the back side of the mounting frame inwhich a coupling member couples inner end portions, which face eachother, of a first speaker holder and a second speaker holder.

FIG. 6 illustrates an example of a section taken along a VI-VI lineillustrated in FIG. 5D.

FIG. 7A illustrates an example of a state of the mounting frameillustrated in FIG. 5D before the inner chassis is fit in the mountingframe.

FIG. 7B illustrates an example of a state of the mounting frameillustrated in FIG. 7A after the inner chassis is fit in the mountingframe.

FIG. 8 illustrates an example of a section taken along a VIII-VIII lineillustrated in FIG. 7B.

FIG. 9A illustrates an enlarged view showing an example of details ofthe first speaker holder and the second speaker holder illustrated inFIG. 4A viewed from the front side of the mounting frame.

FIG. 9B illustrates an example of a state where the first film speakerand the second film speaker are bonded to the first speaker holder andthe second speaker holder illustrated in FIG. 9A.

FIG. 10 illustrates an explanatory diagram showing an example of a stateof the first speaker holder and the second speaker holder illustrated inFIG. 9B when viewed from the back side and a state where a secondarybattery is disposed on the front side of the mounting frame.

FIG. 11 illustrates an example of a section taken along an XI-XI lineillustrated in FIG. 10.

FIG. 12 illustrates an example of another embodiment of a section takenalong the XI-XI line illustrated in FIG. 10.

DETAILED DESCRIPTION

With reference to FIG. 1A and FIG. 1B, a mobile device (for example, amobile phone) 10 in one embodiment is a smartphone as an example. Anexternal appearance of the mobile device 10 includes a back panel 12,part of a mounting frame 14, and a front panel 16 so as to have anelongated flat rectangular shape, for example. It is previously pointedout that the disclosure is applicable to not only the smartphone butalso any mobile devices such as a tablet PC (Personal Computer) and aPDA (Personal Digital Assistant).

A touch panel 20 may be formed integrally with the front panel 16.Further, a display 18 (display unit) includes for example, liquidcrystals or organic EL (Electro-Luminescence) bonded to a back surfaceof the front panel 16.

A hole 22 for inputting sound to a microphone located inside the mobiledevice 10 is positioned on the right side of a lower side surface of themobile device 10. A built-in piezoelectric element (not shown) forconverting a sound signal to vibrations is included on the upper side ofthe mobile device 10. For example, when a sound signal is input to thepiezoelectric element, the piezoelectric element converts the soundsignal to vibrations and directly vibrates the display 18 (front panel16). This allows a user to hear the sound output from the display 18.Since the sound is output in this manner, the mobile device 10 may notbe supplied with a sound emitting hole for outputting a received voice,for example.

A first film speaker 30 a and a second film speaker 30 b that aredescribed below are built in the mobile device 10. Sounds from the firstfilm speaker 30 a and the second film speaker 30 b are output from notonly two first sound emitting holes 24 a located in a back surface ofthe back panel 12 but also two second sound emitting holes 24 b locatedin side surfaces of the back panel 12 in one embodiment.

A hole 26 connected to a charging terminal (not shown) located inside islocated in the middle of the lower side surface of the mobile device 10.

For example, when an operation of a call is performed to start the voicecall, a received voice is output from the front panel 16 by vibrationsof the piezoelectric element mentioned above. On the other hand, aspeaking voice of a user is input to the microphone through the hole 22and transmitted to a phone at the other end of the call. When anincoming call from the other phone is notified, a ringer tone is outputfrom a built-in film speaker. The first film speaker 30 a and the secondfilm speaker 30 b are built in the mobile device 10 in one embodiment,so that a stereo sound can also be reproduced.

When a charging connector is connected to the charging terminal throughthe hole 26, a secondary battery 44 (see FIG. 3) of the mobile device 10can be supplied with charging power from an external power supply.

FIG. 2A illustrates an explanatory diagram showing an externalappearance of a film speaker 30 used in one embodiment when viewed fromthe front. FIG. 2B illustrates a cross-sectional view taken along aIIB-IIB line illustrated in FIG. 2A. In addition, the film speaker 30illustrated in this diagram is used as the first film speaker 30 a andthe second film speaker 30 b built in the mobile device 10, and thusdescriptions are given here without differentiating between a first filmspeaker and a second film speaker. Hereinafter, to differentiate betweenthe first film speaker and the second film speaker, reference numbers 30a and 30 b are respectively used.

The film speaker 30 is a flat rectangle and has a thickness of 0.7 mm,for example. The film speaker 30 comprises a piezoelectric element 32having the same rectangular shape. The piezoelectric element 32 islocated substantially in the center of the film speaker 30 when viewedfrom a surface of the film speaker 30 from which sound is output,namely, the front (FIG. 2A) of the film speaker 30. The piezoelectricelement 32 is resin-coated with a resin coating layer 34. A resin film36 is bonded to a surface of the resin coating layer 34. A frame 38 islocated on the periphery of the film speaker 30 to support the resincoating layer 34 and the resin film 36. The application of a soundsignal to the piezoelectric element 32 of such a film speaker 30 causesthe piezoelectric element 32 to vibrate, and the vibrations aretransmitted to the entire film speaker 30 comprising the resin coatinglayer 34 and the resin film 36, so that the sound is output from thefront of the film speaker 30. In addition, the frame 38 is used when thefilm speaker 30 is fixed on a speaker holder 46 (described below).

FIG. 3 illustrates an exploded perspective view showing an outline of aninternal structure of the mobile device 10. With reference to FIG. 3,the mobile device 10 comprises the front panel 16, the display 18, aninner chassis 42, the secondary battery 44, the first film speaker 30 aand the second film speaker 30 b, the mounting frame 14, a substrate 48,a coupling member 56, and the back panel 12, and each part is mounted inthe mobile device 10 in the stated order from the front (upper side inFIG. 3). The back panel 12 is mounted and cooperates with the mountingframe 14 to create space inside the back panel 12, and thus sounds fromthe first film speaker 30 a and the second film speaker 30 b are emittedfrom the first sound emitting holes 24 a and the second sound emittingholes 24 b to the outside of the space.

The main surface of the mobile device 10 includes the surface of frontpanel 16. The front panel 16 may be made of a glass so as to have anelongated flat rectangular shape, for example. As described above, thetouch panel 20 may be formed integrally with the back surface of thefront panel 16. The display 18 is bonded to the back surface of thefront panel 16 with an adhesive or an optical clear adhesive (OCA) tape.

The inner chassis 42 comprises a rectangular resin frame and a shieldplate 40 of metal (conductive material) located so as to cover almostthe entire surface of the inside of the frame. The frame of the innerchassis 42 has a thickness equal to or slightly thinner than a thicknessof a set of the shield plate 40 and the secondary battery 44 in layers.The front panel 16 to which the display 18 is bonded as described aboveis disposed on the front side of the inner chassis 42, namely, the frontside of the shield plate 40. On the other hand, a recessed portion (notshown) for retaining the secondary battery 44 (allowing the secondarybattery 44 to be fit therein) is provided on the back side of the innerchassis 42. Therefore, the secondary battery 44 is disposed on the backside of the display 18 with respect to the shield plate 40. The innerchassis 42 stably retains the secondary battery 44 on the back side ofthe display 18. In addition, the inner chassis 42, particularly theresin frame, is sometimes referred to as a battery retainer.

FIG. 4A illustrates a plan view showing an example of the mounting frame14 when viewed from the front (also referred to as the front side), andFIG. 4B illustrates a plan view showing an example of the mounting frame14 when viewed from the back side. With reference to FIG. 4A and FIG. 4Btogether with FIG. 3, the mounting frame 14 has a planar rectangularshape similarly to the front panel 16 and the inner chassis 42. A framecomprising a pair of vertical frames 70 (first pair of frame members)and a pair of horizontal frames 72 (second pair of frame members) may beformed together with each part described below by resin molding.Hereinafter, one and the other of the vertical frames 70 in a pair arealso referred to as a first vertical frame 70 a and a second verticalframe 70 b, respectively, and one and the other of the horizontal frames72 in a pair are also referred to as a first horizontal frame 72 a and asecond horizontal frame 72 b, respectively. The first vertical frame 70a and the second vertical frame 70 b are disposed at a predeterminedinterval. The first horizontal frame 72 a connects the upper portions ofthe pair of the vertical frames 70 to each other. The second horizontalframe 72 b connects the lower portions of the pair of the verticalframes 70 to each other.

A first speaker holder 46 a and a second speaker holder 46 b both havinga plate shape are formed so as to extend inwardly respectively from theinside of the first vertical frame 70 a and the inside of the secondvertical frame 70 b and to face each other in the direction in whichthey extend. Sound emitting holes 74 having a hexagonal shape, forexample, are each formed in the center of the first speaker holder 46 aand the second speaker holder 46 b to emit sounds from the first filmspeaker 30 a and the second film speaker 30 b (FIG. 5B, for example)retained in the first speaker holder 46 a and the second speaker holder46 b.

The first speaker holder 46 a and the second speaker holder 46 b haveribs 90 (see FIG. 9), which are described in detail below, on theperipheries of the front surfaces of the first speaker holder 46 a andthe second speaker holder 46 b. The first speaker holder 46 a and thesecond speaker holder 46 b have the planar rectangular plate shape inone embodiment, but the shape of the first speaker holder 46 a and thesecond speaker holder 46 b is not limited to this. It suffices that thefirst speaker holder 46 a and the second speaker holder 46 b each haveat least a region in which the frame 38 in FIG. 2A and FIG. 2B can bemounted (bonded). The sound emitting holes 74 may be larger or smaller.

The inner chassis 42 is fit in the frame of the mounting frame 14. Thus,the inner surfaces of the pair of vertical frames 70 and the pair ofhorizontal frames 72 have an interior wall surface 60 (also see FIGS. 6and 8, for example) in which the inner chassis 42 can be fit. In otherwords, the interior wall surface 60 contacts the outer surface of theresin frame of the inner chassis 42, so that the inner chassis 42 is fitin the mounting frame 14.

Moreover, the mounting frame 14 has a panel supporter 62 and an interiorwall surface 64 (also see FIGS. 6 and 8, for example) for housing thefront panel 16 and allowing the front panel 16 to be mounted thereon.The panel supporter 62 and the interior wall surface 64 as well as theinterior wall surface 60 have a step shape. More specifically, the panelsupporter 62 is a planar portion extending outwardly from an end of theinterior wall surface 60 on the front side of the mounting frame 14 (anend toward the front of the paper plane in FIG. 4A and FIG. 4B, and anend on the lower side of the paper plane in FIG. 6). The interior wallsurface 64 extends from the outer end of the panel supporter 62 to thefront side (the side toward the front of the paper plane in FIG. 4A andFIG. 4B, and the lower side of the paper plane in FIG. 6). Theperipheral portion of the front panel 16 is disposed on the panelsupporter 62. Thus, the front panel 16 is housed inside the interiorwall surface 64.

A portion 66 (also see FIGS. 6 and 8, for example), which is locatedoutside the interior wall surface 64, of each of the pair of verticalframes 70 and the pair of horizontal frames 72 is an exposed portionthat is exposed as the exterior appearance (FIG. 1A and FIG. 1B) of themobile device 10. Therefore, when the front panel 16 is mounted insidethe interior wall surface 64 and on the panel supporter 62, the frontsurface of the front panel 16 is in the same plane or substantially thesame plane as (is flush with) the front surface of the outer portion 66.

An assembly portion 76 on which parts such as a camera module areassembled is located from the inside of the first horizontal frame 72 ato the upper ends of the first speaker holder 46 a and the secondspeaker holder 46 b. The assembly portion 76 has a rectangular hole 78for allowing wiring to pass therethrough. Two substrate recessedportions 80 for allowing the substrate 48 with the shape illustrated inFIG. 3 to be disposed thereon are located in the assembly portion 76 onthe back side (FIG. 4B) of the mounting frame 14. As seen from FIG. 3,the side surface of the second horizontal frame 72 b has a hole 22 aconnected to the microphone and a hole 26 a connected to the chargingterminal.

Referring back to FIG. 3, the substrate 48 is made of resin, glassfiber, or the like, and has a first portion 50, a second portion 52having a substantially rectangular shape, and a third portion 54 thathas an elongated shape and connects the first portion 50 and the secondportion 52 to each other. The substrate 48 comprises predeterminedwiring formed thereon and comprises necessary parts such as themicrophone mounted thereon.

It should be noted that the shape and the size of the first portion 50,the second portion 52, and the third portion 54 of the substrate 48 arenot limited to the shape and the size in one embodiment.

The coupling member 56 is made of resin or the like and has a bodyportion and two locking portions 82 (see FIG. 6) located on each of theleft and the right of the body portion. The coupling member 56 couplesthe inner end portions, which face each other, of the first speakerholder 46 a and the second speaker holder 46 b. A means of mounting thecoupling member 56 is described in detail below.

The side surfaces and the bottom surface (back surface) of the mobiledevice 10 includes a surface of the back panel 12 as illustrated in FIG.1A and FIG. 1B. The back panel 12 may be made of resin so as to have arectangular box shape. The bottom surface of the back panel 12 has thefirst sound emitting holes 24 a, and the left and right side surfaces ofthe back panel 12 have the second sound emitting holes 24 b. The lowerside surface of the back panel 12 has a hole 22 b connected to themicrophone and a hole 26 b connected to the charging terminal.

The inner chassis 42, the secondary battery 44, the first film speaker30 a, the second film speaker 30 b, the substrate 48, and the couplingmember 56 that are described above are mounted in the mounting frame 14.Then, the front panel 16 is mounted on the front side of the mountingframe 14 in which they are mounted, and the back panel 12 is mounted onthe back side of the mounting frame 14.

Next, a procedure for mounting parts in the mounting frame 14 isdescribed. First, with reference to FIG. 5A and FIG. 5B, the first filmspeaker 30 a and the second film speaker 30 b are respectively bonded tothe first speaker holder 46 a and the second speaker holder 46 b withbonding means such as a double-faced tape on the front side of themounting frame 14. At this time, the first film speaker 30 a and thesecond film speaker 30 b are bonded such that each of the surfaces fromwhich sounds are emitted, namely, the front surface faces thecorresponding sound emitting hole 74. The bonding means such as thedouble-faced tape (OCA tape) bonds the frames 38, which are illustratedin FIG. 2A and FIG. 2B, of the first film speaker 30 a and the secondfilm speaker 30 b to the corresponding first speaker holder 46 a andsecond speaker holder 46 b. While the first film speaker 30 a and thesecond film speaker 30 b are bonded to the first speaker holder 46 a andthe second speaker holder 46 b, the first film speaker 30 a and thesecond film speaker 30 b can be visually identified through the soundemitting holes 74 from the back side of the mounting frame 14.

With reference to FIG. 5C and FIG. 5D, the substrate 48 is disposed onthe back side of the mounting frame 14. At this time, the first portion50 of the substrate 48 is disposed above the first speaker holder 46 aand the second speaker holder 46 b such that the first portion 50overlaps part of the assembly portion 76, and the second portion 52 isdisposed below the first speaker holder 46 a and the second speakerholder 46 b. The third portion 54 passes between the first speakerholder 46 a and the second speaker holder 46 b and is disposed insubstantially the same plane as the first film speaker 30 a and thesecond film speaker 30 b. As a result, the hole 78 and the substraterecessed portions 80 in the assembly portion 76 are covered with thesubstrate 48. The substrate 48 is disposed on the back side of themounting frame 14 so as to avoid the first film speaker 30 a and thesecond film speaker 30 b. Thus, for example, the first film speaker 30 aand the second film speaker 30 b can be disposed in the same plane orsubstantially the same plane as the substrate 48, so that the thicknesscan be further reduced. Moreover, the third portion 54 connects thefirst portion 50 and the second portion 52 to each other, and thecoupling member 56 over the third portion 54 couples the first speakerholder 46 a and the second speaker holder 46 b. Thus, the first speakerholder 46 a and the second speaker holder 46 b having great rigidity canbe realized without reducing an area that can be used for the substrate48.

Next, as illustrated in FIG. 5D, the coupling member 56 over the thirdportion 54 of the substrate 48 is locked to the first speaker holder 46a and the second speaker holder 46 b such that the coupling member 56couples the inner end portions, which face each other, of the firstspeaker holder 46 a and the second speaker holder 46 b.

Specifically, with reference to FIG. 6 that is a cross-sectional viewtaken along a VI-VI line in FIG. 5D, each of the locking portions 82located on the coupling member 56 has a hook on the tip. When thecoupling member 56 on the back side of the mounting frame 14 is pushedfrom the upper side of the paper plane in FIG. 6, the locking portions82 are temporarily bent inwardly. When the coupling member 56 is furtherpressed and the tips of the locking portions 82 reach the front side ofthe mounting frame 14, the shape of the locking portions 82 returns tothe original shape. At this time, the hooks located on the tips of thelocking portions 82 are caught on the peripheries of the first speakerholder 46 a and the second speaker holder 46 b, and thus the couplingmember 56 is fixed between the first speaker holder 46 a and the secondspeaker holder 46 b.

As a result, the first speaker holder 46 a and the second speaker holder46 b are in the state of being firmly coupled together with the couplingmember 56, so that the first speaker holder 46 a and the second speakerholder 46 b have a both-end supported beam structure from a cantileverstructure (the state in FIG. 4A and FIG. 4B, for example). In thismanner, the first speaker holder 46 a and the second speaker holder 46 bare integrated, so that each of them has greater rigidity, andvibrations of the first speaker holder 46 a and the second speakerholder 46 b themselves can be suppressed. Thus, sound pressure levels ofthe first film speaker 30 a and the second film speaker 30 b can beincreased.

For example, in a case where the first speaker holder 46 a and thesecond speaker holder 46 b are not coupled together with the couplingmember 56, the first speaker holder 46 a and the second speaker holder46 b remain in the cantilever structure, and the structure supportingthe first film speaker 30 a and the second film speaker 30 b does nothave great rigidity. If sounds are emitted from the first film speaker30 a and the second film speaker 30 b in this state, the vibrations ofthe first film speaker 30 a and the second film speaker 30 b also causethe first speaker holder 46 a and the second speaker holder 46 b tovibrate, and the vibrations of the first speaker holder 46 a and thesecond speaker holder 46 b can diminish the vibrations of the first filmspeaker 30 a and the second film speaker 30 b. On the other hand, if thefirst speaker holder 46 a and the second speaker holder 46 b are coupledtogether with the coupling member 56 and have the both-end supportedbeam structure as in one embodiment, approximately 3 dB of improvementin the sound pressure can be seen.

As illustrated in FIG. 6, the mounting frame 14 is tilted from thecenter toward the first vertical frame 70 a and the second verticalframe 70 b, and the central portion is located higher than the firstvertical frame 70 a and the second vertical frame 70 b. In a case wherethe back panel 12 is mounted on the mounting frame 14, an adhesive isapplied to the coupling member 56, and the coupling member 56 and theback panel 12 are bonded together. In other words, the coupling member56 is also fixed on the back panel 12. Therefore, the first speakerholder 46 a and the second speaker holder 46 b are reinforced also withthe back panel 12, and the further improvement in the sound pressure ispromising.

In another embodiment, the coupling member 56 may have a recessedportion to suppress a leak of the adhesive applied to the couplingmember 56.

FIG. 7A illustrates an explanatory diagram showing a state of themounting frame 14 illustrated in FIG. 5D before the inner chassis 42 isfit in the mounting frame 14. FIG. 7A illustrates a diagram when viewedfrom the front (front side), and the substrate 48 and the couplingmember 56 are mounted on the mounting frame 14 in one example of FIG.7A. In this state, part of the substrate 48 is seen through the hole 78.Further, the hooks on the tips of the locking portions 82 of thecoupling member 56 are caught on the right side of the first speakerholder 46 a and the left side of the second speaker holder 46 b. Asillustrated in FIG. 7A, the coupling member 56 couples the first speakerholder 46 a and the second speaker holder 46 b such that the lockingportions 82 are fit in part of slits 92 (described below) of the firstspeaker holder 46 a and the second speaker holder 46 b.

With reference to FIG. 7B, the inner chassis 42 retaining the secondarybattery 44 is fit in the mounting frame 14 in this state, and thus theinner chassis 42 covers the substrate 48, the first film speaker 30 a,the second film speaker 30 b, the first speaker holder 46 a, the secondspeaker holder 46 b, or the like. In FIG. 7B, the secondary battery 44is indicated by a broken line.

With reference to FIG. 8 illustrating a cross-sectional view taken alonga VIII-VIII line in FIG. 7B, it is clearly seen that the inner chassis42 retains the secondary battery 44. The secondary battery 44 isdisposed on the mounting frame 14 and the shield plate 40, so that thesecondary battery 44 is difficult to come off the inner chassis 42.

Then, the first film speaker 30 a and the second film speaker 30 b arein the state of being retained on the back side of the secondary battery44 by the first speaker holder 46 a and the second speaker holder 46 b.In other words, the first speaker holder 46 a and the second speakerholder 46 b stably retain the first film speaker 30 a and the secondfilm speaker 30 b on the back side of the secondary battery 44.

At this time, the first film speaker 30 a and the second film speaker 30b are disposed side by side on the back side of the secondary battery44, so that the two sound sources are not too far away from each other,and a monophonic sound and a stereo sound tend to sound natural whenbeing reproduced.

In this manner, the mobile device 10 as a whole can be reduced inthickness by using the film speakers and disposing the film speakers onthe back side of the secondary battery.

As illustrated in FIG. 8, the inner chassis 42 retaining the secondarybattery 44 is fit in the interior wall surface 60 of the mounting frame14. The frame of the inner chassis 42 has a thickness including athickness of the shield plate 40 and a thickness of part of thesecondary battery 44. The mounting frame 14 has a thickness includingthe thickness of the shield plate 40, the thickness of the inner chassis42, and the thickness of the secondary battery 44. Thus, even when theinner chassis 42 including the secondary battery 44 fit therein is fitin the mounting frame 14, the thickness of the mounting frame 14 remainsunchanged. In other words, the secondary battery 44 and the innerchassis 42 are completely housed inside the mounting frame 14 and do notprotrude from the mounting frame 14. This configuration also allows themobile device 10 as a whole to be reduced in thickness.

FIG. 9A and FIG. 9B illustrate enlarged views showing details of thefirst speaker holder 46 a and the second speaker holder 46 b. Withreference to FIG. 9A, the peripheries of the first speaker holder 46 aand the second speaker holder 46 b are surrounded by the ribs 90. Theribs 90 have a height set to be higher than a thickness (height) of thefirst film speaker 30 a and the second film speaker 30 b bonded to thefirst speaker holder 46 a and the second speaker holder 46 b. Therefore,when the first film speaker 30 a and the second film speaker 30 b arebonded to the first speaker holder 46 a and the second speaker holder 46b, the ribs 90 are higher than the first film speaker 30 a and thesecond film speaker 30 b. In other words, the ribs 90 protrude to thefront side (toward the secondary battery 44) more than the first filmspeaker 30 a and the second film speaker 30 b. The rib 90 of the firstspeaker holder 46 a has slits 92 at a total of 12 places including 4places on the upper side, 4 places on the lower side, and 4 places onthe right side (center side of the mobile device 10). The rib 90 of thefirst speaker holder 46 a has a wiring recessed portion 94 on the rightside thereof to allow wiring connected to the first film speaker 30 a topass through the wiring recessed portion 94. Similarly, the rib 90 ofthe second speaker holder 46 b has the slits 92 at a total of 12 placesincluding 4 places on the upper side, 4 places on the lower side, and 4places on the left side (center side of the mobile device 10), and hasthe wiring recessed portion 94 on the left side of the rib 90. The slits92 are disposed at an interval on the periphery of each of the firstspeaker holder 46 a and the second speaker holder 46 b. The slits 92have openings on the secondary battery 44 side while penetrating theribs 90 in a parallel direction to the substrate 48 (in a paralleldirection to the paper plane of FIG. 9). It should be noted that thenumber and the size (length or width) of the slits 92 are not limited tothose in one embodiment.

With reference to FIG. 9B, when the first film speaker 30 a and thesecond film speaker 30 b are mounted in the first speaker holder 46 aand the second speaker holder 46 b, the first speaker holder 46 a andthe second speaker holder 46 b retain the first film speaker 30 a andthe second film speaker 30 b while the ribs 90 surround the first filmspeaker 30 a and the second film speaker 30 b.

FIG. 10 illustrates a diagram of the first speaker holder 46 a and thesecond speaker holder 46 b illustrated in FIG. 9B when viewed from theback side. In one example of FIG. 9B, the secondary battery 44 isdisposed on the front side of the mounting frame 14. In this state, thefront of the first film speaker 30 a and the front of the second filmspeaker 30 b are seen through the sound emitting holes 74 of the firstspeaker holder 46 a and the second speaker holder 46 b. The first filmspeaker 30 a and the second film speaker 30 b are in the state of beingdisposed on the back side of the secondary battery 44.

FIG. 11 illustrates a cross-sectional view taken along an XI-XI line inFIG. 10 and mainly illustrates a section of the rib 90 of the firstspeaker holder 46 a retaining the first film speaker 30 a. Withreference to FIG. 11, the upper end face (lower side in FIG. 11) of therib 90 faces the back surface of the secondary battery 44. The rib 90 ishigher than the first film speaker 30, and thus substantially the entirefirst film speaker 30 a is covered with the rib 90 and part of the firstfilm speaker 30 a can be confirmed through the slits 92 in thecross-sectional view. The upper end face of the rib 90 higher than thefirst film speaker 30 a faces the secondary battery 44, to thereby keepa gap between the secondary battery 44 and the first film speaker 30 a.In other words, in a case where the secondary battery 44 is expandedover time by being repeatedly charged and discharged, the rib 90functions as a stopper and the upper end face of the rib 90 contacts themain surface of the expanded secondary battery 44. Therefore, the mainsurface of the secondary battery 44 is difficult to be further displacedtoward the first film speaker 30 a. Therefore, the rib 90 can stablykeep the gap between the first film speaker 30 a and the secondarybattery 44.

With the rib 90 surrounding the first film speaker 30 a, the inner spaceand the outer space of the rib 90 that houses the first film speaker 30a or the second film speaker 30 b communicate with each other throughthe slits 92. Thus, a rear volume of the first film speaker 30 a can besufficiently kept, and acoustic performance of the first film speaker 30a can be improved.

The rib 90 located on the upper side and the left side (center side) ofthe first speaker holder 46 a, the rib 90 of the second speaker holder46 b, and the second film speaker 30 b are substantially the same asthose in FIG. 11, and thus detailed drawings are omitted.

With reference to FIG. 12, in another embodiment, the first speakerholder 46 a (for example, the rib 90) may be fixed on (bonded to) thesecondary battery 44 with a fixing portion such as an adhesive 96 orfixing means to further improve the sound pressure level of the firstfilm speaker 30 a. The first speaker holder 46 a is fixed on thesecondary battery 44 by using the secondary battery 44 having thegreatest weight in the mobile device 10 and great rigidity as in oneembodiment.

The second speaker holder 46 b (for example, the rib 90) may be bondedto the secondary battery 44 with the adhesive 96 or the like similarlyto the first speaker holder 46 a, which is omitted from the diagram.

In one embodiment in FIG. 12 as described above, the rib 90, forexample, is fixed on the secondary battery 44, and the rib 90 and thesecondary battery 44 are integrated, so that the rigidity of the firstspeaker holder 46 a and the second speaker holder 46 b is reinforcedwith the rigidity of the secondary battery 44, to thereby furtherincrease the rigidity of the first speaker holder 46 a and the secondspeaker holder 46 b. As a result, the vibrations of the first speakerholder 46 a and the second speaker holder 46 b caused by the vibrationsof the first film speaker 30 a and the second film speaker 30 b can besuppressed. Consequently, the sound pressure levels of the first filmspeaker 30 a and the second film speaker 30 b can be increased.

By fixing the first speaker holder 46 a and the second speaker holder 46b on the secondary battery 44, the first film speaker 30 a and thesecond film speaker 30 b can keep a fixed distance from the secondarybattery 44 at the occurrence of the phenomenon in which the secondarybattery 44 is expanded over time by being repeatedly charged anddischarged. Thus, variations in the rear volume of the first filmspeaker 30 a and the second film speaker 30 b can be suppressed.

In one embodiment in FIG. 12, the first speaker holder 46 a and thesecond speaker holder 46 b may be fixed on the secondary battery 44 witha double-faced tape or a fitting (locking) mechanism.

Further, in one embodiment described above, the substrate 48 includesthe first portion 50, the second portion 52, and the third portion 54,but the shape of the substrate 48 may be modified in various ways.

For example, the substrate 48 may be formed as one large rectangularsubstrate and may be disposed so as to overlap the mounting frame 14. Inthis case, it cannot be expected that the substrate 48 is reduced inthickness by being disposed between the first film speaker 30 a and thesecond film speaker 30 b, but the first speaker holder 46 a and thesecond speaker holder 46 b do not need to be located separately. Thus,the both-end supported beam structure is applicable as the structure ofthe first speaker holder 46 a and the second speaker holder 46 b withoutusing the coupling member 56, which can increase the rigidity.

Alternatively, the substrate may have only a part corresponding to onlythe second portion 50. Also in this case, the first speaker holder 46 aand the second speaker holder 46 b that are integrated can be formedwhile the coupling member 56 is omitted.

In one embodiment, the first film speaker 30 a, the second film speaker30 b, and the ribs 90 have the rectangular shape, but at least any oneof them may have a circular shape or another shape instead of therectangular shape in another embodiment.

In one embodiment, the ribs 90 are formed so as to surround the firstfilm speaker 30 a and the second film speaker 30 b, that is to say, theribs 90 are formed all around the first film speaker 30 a and the secondfilm speaker 30 b. In still another embodiment, the ribs 90 may includeonly ribs corresponding to at least one side of the first film speaker30 a and the second film speaker 30 b. The ribs 90 may not surround thefirst film speaker 30 a and the second film speaker 30 b.

One embodiment described above comprises the two film speakers 30 a, 30b, but the film speaker 30 may comprise only one of them to furtherreduce the mobile device in size or to further increase the inner space.In this case, only one group of the first sound emitting holes 24 a arelocated in the main surface of the housing member, and only one group ofthe second sound emitting holes 24 b are located in positionscorresponding to the first sound emitting holes 24 a in the side surfaceof the housing member. In the case where only one film speaker 30 isused as described above, sounds may be output from both of the firstsound emitting holes 24 a and the second sound emitting holes 24 blocated at some distance from the first sound emitting holes 24 a,thereby providing a better sense of realism than the case where only thefirst sound emitting holes 24 a are formed.

Any specific numeric values in the disclosure are merely an example, andmay be changed suitably according to modifications of specifications ofproducts.

Some examples of the points in one embodiment are summarized below. In afirst aspect of one embodiment, a mobile device comprises a display, abattery disposed on the back side of the display, and a film speakerdisposed on the back side of the battery.

A second aspect of one embodiment is dependent on the first aspect. Themobile device further comprises a speaker holder retaining the filmspeaker on the back side of the battery.

A third aspect of one embodiment is dependent on the second aspect. Thespeaker holder retains the film speaker inside the speaker holder andcomprises a rib higher than a thickness of the film speaker, an upperend face of the rib facing the battery.

A fourth aspect of one embodiment is dependent on the third aspect. Atleast part of the rib has a slit.

A fifth aspect of one embodiment is dependent on the third aspect or thefourth aspect. The mobile device further comprises a fixing portionfixing the rib on the battery.

A sixth aspect of one embodiment is dependent on any of the secondaspect to the fifth aspect. The film speaker comprises a first filmspeaker and a second film speaker, and the speaker holder comprises afirst speaker holder retaining the first film speaker and a secondspeaker holder retaining the second film speaker.

A seventh aspect of one embodiment is dependent on the sixth aspect. Themobile device further comprises a mounting frame that comprises a firstpair of frame members disposed at an interval and a second pair of framemembers coupling the first pair of frame members. The first speakerholder and the second speaker holder are formed so as to extend inwardlyfrom the inside of each of the first pair of frame members and to faceeach other.

An eighth aspect of one embodiment is dependent on the seventh aspect.The mobile device further comprises a coupling member coupling inner endportions, which face each other, of the first speaker holder and thesecond speaker holder.

A ninth aspect of one embodiment is dependent on the eighth aspect. Themobile device further comprises a substrate having a first portion, asecond portion, and a third portion that connects the first portion andthe second portion to each other. The third portion of the substratepasses between the first speaker holder and the second speaker holderand is disposed in the same plane or substantially the same plane as thefirst film speaker and the second film speaker. The coupling member overthe third portion of the substrate couples the first speaker holder andthe second speaker holder.

A tenth aspect of one embodiment is dependent on any of the seventhaspect to the ninth aspect. The mobile device further comprises abattery retainer retaining the battery on the back side of the display.The battery retainer is mounted in the mounting frame while retainingthe battery.

An eleventh aspect of one embodiment is dependent on any of the firstaspect to the tenth aspect. The mobile device further comprises a backpanel having a sound emitting hole.

The disclosure is described in detail, but the above description is theexemplification in all aspects and embodiments of the present disclosureare not intended to be limited thereto. It is construed that numerousmodifications which are not exemplified can be envisaged withoutdeparting from the scope of the present disclosure.

The invention claimed is:
 1. A mobile device, comprising: a display; abattery disposed on a back side of the display; a film speaker disposedon a back side of the battery; a speaker holder that retains the filmspeaker on the back side of the battery, wherein the speaker holderretains the film speaker inside the speaker holder and comprises a ribhigher than a thickness of the film speaker, an upper end face of therib facing the battery.
 2. The mobile device according to claim 1,wherein at least part of the rib includes a slit.
 3. The mobile deviceaccording to claim 1, further comprising a fixing portion fixing the ribon the battery.
 4. The mobile device according to claim 1, wherein thefilm speaker comprises a first film speaker and a second film speaker,and the speaker holder comprises a first speaker holder retaining thefirst film speaker and a second speaker holder retaining the second filmspeaker.
 5. The mobile device according to claim 4, further comprising amounting frame that comprises a first pair of frame members disposed atan interval and a second pair of frame members coupling the first pairof frame members, wherein the first speaker holder and the secondspeaker holder are located so as to extend inwardly from the inside ofeach of the first pair of frame members and to face each other.
 6. Themobile device according to claim 5, further comprising a coupling memberthat couples inner end portions, which face each other, of the firstspeaker holder and the second speaker holder.
 7. A mobile device,comprising: a display; a battery disposed on the back side of thedisplay; a film speaker disposed on the back side of the battery; aspeaker holder that retains the film speaker on the back side of thebattery, wherein the film speaker comprises a first film speaker and asecond film speaker, and the speaker holder comprises a first speakerholder retaining the first film speaker and a second speaker holderretaining the second film speaker; a mounting frame that comprises afirst pair of frame members disposed at an interval and a second pair offrame members coupling the first pair of frame members, wherein thefirst speaker holder and the second speaker holder are located so as toextend inwardly from the inside of each of the first pair of framemembers and to face each other; a coupling member that couples inner endportions, which face each other, of the first speaker holder and thesecond speaker holder; a substrate including a first portion, a secondportion, and a third portion that connects the first portion and thesecond portion to each other, wherein the third portion of the substratepasses between the first speaker holder and the second speaker holderand is disposed in the same plane or substantially the same plane as thefirst film speaker and the second film speaker, and the coupling memberover the third portion of the substrate couples the first speaker holderand the second speaker holder.